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                    快速上手
            
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                    基础类型
            
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                    接口
            
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                    类
            
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                    函数
            
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                    泛型
            
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                    枚举
            
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                    类型推论
            
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                    类型兼容性
            
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                    高级类型
            
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                    实用工具类型
            
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                    Symbols
            
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                    Iterators 和 Generators
            
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                    模块
            
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                    命名空间
            
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                    命名空间和模块
            
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                    模块解析
            
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                    声明合并
            
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                    书写.d.ts文件
            
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                    JSX
            
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                    Decorators
            
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                    混入
            
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                    三斜线指令
            
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                    JavaScript文件里的类型检查
            
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                    如何书写声明文件
            
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                    结构
            
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                    规范
            
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                    举例
            
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                    深入
            
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                    发布
            
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                    使用
            
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                    工程配置
            
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                    tsconfig.json
            
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                    工程引用
            
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                    NPM包的类型
            
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                    编译选项
            
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                    配置 Watch
            
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                    在MSBuild里使用编译选项
            
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                    与其它构建工具整合
            
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                    使用TypeScript的每日构建版本
            
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                    Wiki
            
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                    TypeScript里的this
            
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                    编码规范
            
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                    常见编译错误
            
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        <li class="chapter " data-level="1.6.4" data-path="../wiki/TypeScript-Editor-Support.html">
            
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                    支持TypeScript的编辑器
            
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        <li class="chapter " data-level="1.6.5" data-path="../wiki/Using-TypeScript-With-ASP.NET-5.html">
            
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                    结合ASP.NET v5使用TypeScript
            
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        <li class="chapter " data-level="1.6.6" data-path="../wiki/Architectural-Overview.html">
            
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                    架构概述
            
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        <li class="chapter " data-level="1.6.7" data-path="../wiki/Roadmap.html">
            
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                    发展路线图
            
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        <li class="chapter " data-level="1.7" data-path="./">
            
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                    新增功能
            
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        <li class="chapter " data-level="1.7.1" data-path="TypeScript 3.1.html">
            
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                    TypeScript 3.1
            
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                    TypeScript 3.0
            
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                    TypeScript 2.9
            
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                    TypeScript 2.8
            
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                    TypeScript 2.7
            
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                    TypeScript 2.6
            
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                    TypeScript 2.5
            
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                    TypeScript 2.4
            
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                    TypeScript 2.3
            
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                    TypeScript 2.2
            
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                    TypeScript 2.1
            
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                    TypeScript 2.0
            
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                    TypeScript 1.8
            
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                    TypeScript 1.7
            
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                    TypeScript 1.6
            
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                    TypeScript 1.5
            
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                    TypeScript 1.4
            
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                    TypeScript 1.3
            
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        <li class="chapter " data-level="1.7.19" data-path="TypeScript 1.1.html">
            
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                    TypeScript 1.1
            
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        <li class="chapter " data-level="1.8" data-path="../breaking-changes/breaking-changes.html">
            
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                    Breaking Changes
            
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                    TypeScript 2.4
            
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                    TypeScript 2.3
            
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        <li class="chapter " data-level="1.8.3" data-path="../breaking-changes/TypeScript 2.2.html">
            
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                    TypeScript 2.2
            
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        <li class="chapter " data-level="1.8.4" data-path="../breaking-changes/TypeScript 2.1.html">
            
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                    TypeScript 2.1
            
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        <li class="chapter " data-level="1.8.5" data-path="../breaking-changes/TypeScript 2.0.html">
            
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                    TypeScript 2.0
            
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        <li class="chapter " data-level="1.8.6" data-path="../breaking-changes/TypeScript 1.8.html">
            
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                    TypeScript 1.8
            
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        <li class="chapter " data-level="1.8.7" data-path="../breaking-changes/TypeScript 1.7.html">
            
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                    TypeScript 1.7
            
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        <li class="chapter " data-level="1.8.8" data-path="../breaking-changes/TypeScript 1.6.html">
            
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                    TypeScript 1.6
            
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                                <h1 id="typescript-17">TypeScript 1.7</h1>
<h2 id="&#x652F;&#x6301;-asyncawait-&#x7F16;&#x8BD1;&#x5230;-es6-node-v4">&#x652F;&#x6301; <code>async</code>/<code>await</code> &#x7F16;&#x8BD1;&#x5230; ES6 (Node v4+)</h2>
<p>TypeScript &#x76EE;&#x524D;&#x5728;&#x5DF2;&#x7ECF;&#x539F;&#x751F;&#x652F;&#x6301; ES6 generator &#x7684;&#x5F15;&#x64CE; (&#x6BD4;&#x5982; Node v4 &#x53CA;&#x4EE5;&#x4E0A;&#x7248;&#x672C;) &#x4E0A;&#x652F;&#x6301;&#x5F02;&#x6B65;&#x51FD;&#x6570;. &#x5F02;&#x6B65;&#x51FD;&#x6570;&#x524D;&#x7F6E; <code>async</code> &#x5173;&#x952E;&#x5B57;; <code>await</code> &#x4F1A;&#x6682;&#x505C;&#x6267;&#x884C;, &#x76F4;&#x5230;&#x4E00;&#x4E2A;&#x5F02;&#x6B65;&#x51FD;&#x6570;&#x6267;&#x884C;&#x540E;&#x8FD4;&#x56DE;&#x7684; promise &#x88AB; fulfill &#x540E;&#x83B7;&#x5F97;&#x5B83;&#x7684;&#x503C;.</p>
<h3 id="&#x4F8B;&#x5B50;">&#x4F8B;&#x5B50;</h3>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;, &#x8F93;&#x5165;&#x7684;&#x5185;&#x5BB9;&#x5C06;&#x4F1A;&#x5EF6;&#x65F6; 400 &#x6BEB;&#x79D2;&#x9010;&#x4E2A;&#x6253;&#x5370;:</p>
<pre><code class="lang-ts"><span class="hljs-meta">&quot;use strict&quot;</span>;

<span class="hljs-comment">// printDelayed &#x8FD4;&#x56DE;&#x503C;&#x662F;&#x4E00;&#x4E2A; &apos;Promise&lt;void&gt;&apos;</span>
async <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">printDelayed</span>(<span class="hljs-params">elements: <span class="hljs-built_in">string</span>[]</span>) </span>{
    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">const</span> element of elements) {
        await delay(<span class="hljs-number">400</span>);
        <span class="hljs-built_in">console</span>.log(element);
    }
}

async <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">delay</span>(<span class="hljs-params">milliseconds: <span class="hljs-built_in">number</span></span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> Promise&lt;<span class="hljs-built_in">void</span>&gt;(resolve =&gt; {
        setTimeout(resolve, milliseconds);
    });
}

printDelayed([<span class="hljs-string">&quot;Hello&quot;</span>, <span class="hljs-string">&quot;beautiful&quot;</span>, <span class="hljs-string">&quot;asynchronous&quot;</span>, <span class="hljs-string">&quot;world&quot;</span>]).then(() =&gt; {
    <span class="hljs-built_in">console</span>.log();
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;&#x6253;&#x5370;&#x6BCF;&#x4E00;&#x4E2A;&#x5185;&#x5BB9;!&quot;</span>);
});
</code></pre>
<p>&#x67E5;&#x770B; <a href="http://blogs.msdn.com/b/typescript/archive/2015/11/03/what-about-async-await.aspx" target="_blank">Async Functions</a> &#x4E00;&#x6587;&#x4E86;&#x89E3;&#x66F4;&#x591A;.</p>
<h2 id="&#x652F;&#x6301;&#x540C;&#x65F6;&#x4F7F;&#x7528;---target-es6-&#x548C;---module">&#x652F;&#x6301;&#x540C;&#x65F6;&#x4F7F;&#x7528; <code>--target ES6</code> &#x548C; <code>--module</code></h2>
<p>TypeScript 1.7 &#x5C06; <code>ES6</code> &#x6DFB;&#x52A0;&#x5230;&#x4E86; <code>--module</code> &#x9009;&#x9879;&#x652F;&#x6301;&#x7684;&#x9009;&#x9879;&#x7684;&#x5217;&#x8868;, &#x5F53;&#x7F16;&#x8BD1;&#x5230; <code>ES6</code> &#x65F6;&#x5141;&#x8BB8;&#x6307;&#x5B9A;&#x6A21;&#x5757;&#x7C7B;&#x578B;. &#x8FD9;&#x8BA9;&#x4F7F;&#x7528;&#x5177;&#x4F53;&#x8FD0;&#x884C;&#x65F6;&#x4E2D;&#x4F60;&#x9700;&#x8981;&#x7684;&#x7279;&#x6027;&#x66F4;&#x52A0;&#x7075;&#x6D3B;.</p>
<h3 id="&#x4F8B;&#x5B50;">&#x4F8B;&#x5B50;</h3>
<pre><code class="lang-json">{
    <span class="hljs-string">&quot;compilerOptions&quot;</span>: {
        <span class="hljs-string">&quot;module&quot;</span>: <span class="hljs-string">&quot;amd&quot;</span>,
        <span class="hljs-string">&quot;target&quot;</span>: <span class="hljs-string">&quot;es6&quot;</span>
    }
}
</code></pre>
<h2 id="this-&#x7C7B;&#x578B;"><code>this</code> &#x7C7B;&#x578B;</h2>
<p>&#x5728;&#x65B9;&#x6CD5;&#x4E2D;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x5BF9;&#x8C61; (&#x4E5F;&#x5C31;&#x662F; <code>this</code>) &#x662F;&#x4E00;&#x79CD;&#x521B;&#x5EFA;&#x94FE;&#x5F0F; API &#x7684;&#x5E38;&#x89C1;&#x65B9;&#x5F0F;. &#x6BD4;&#x5982;, &#x8003;&#x8651;&#x4E0B;&#x9762;&#x7684; <code>BasicCalculator</code> &#x6A21;&#x5757;:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">class</span> BasicCalculator {
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">constructor</span>(protected value: number = 0) { }

    <span class="hljs-keyword">public</span> currentValue(): <span class="hljs-built_in">number</span> {
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.value;
    }

    <span class="hljs-keyword">public</span> add(operand: <span class="hljs-built_in">number</span>) {
        <span class="hljs-keyword">this</span>.value += operand;
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }

    <span class="hljs-keyword">public</span> subtract(operand: <span class="hljs-built_in">number</span>) {
        <span class="hljs-keyword">this</span>.value -= operand;
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }

    <span class="hljs-keyword">public</span> multiply(operand: <span class="hljs-built_in">number</span>) {
        <span class="hljs-keyword">this</span>.value *= operand;
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }

    <span class="hljs-keyword">public</span> divide(operand: <span class="hljs-built_in">number</span>) {
        <span class="hljs-keyword">this</span>.value /= operand;
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }
}
</code></pre>
<p>&#x4F7F;&#x7528;&#x8005;&#x53EF;&#x4EE5;&#x8FD9;&#x6837;&#x8868;&#x8FF0; <code>2 * 5 + 1</code>:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">import</span> calc from <span class="hljs-string">&quot;./BasicCalculator&quot;</span>;

<span class="hljs-keyword">let</span> v = <span class="hljs-keyword">new</span> calc(<span class="hljs-number">2</span>)
    .multiply(<span class="hljs-number">5</span>)
    .add(<span class="hljs-number">1</span>)
    .currentValue();
</code></pre>
<p>&#x8FD9;&#x4F7F;&#x5F97;&#x8FD9;&#x4E48;&#x4E00;&#x79CD;&#x4F18;&#x96C5;&#x7684;&#x7F16;&#x7801;&#x65B9;&#x5F0F;&#x6210;&#x4E3A;&#x53EF;&#x80FD;; &#x7136;&#x800C;, &#x5BF9;&#x4E8E;&#x60F3;&#x8981;&#x53BB;&#x7EE7;&#x627F; <code>BasicCalculator</code> &#x7684;&#x7C7B;&#x6765;&#x8BF4;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;. &#x60F3;&#x8C61;&#x4F7F;&#x7528;&#x8005;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x7F16;&#x5199;&#x4E00;&#x4E2A; <code>ScientificCalculator</code>:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">import</span> BasicCalculator from <span class="hljs-string">&quot;./BasicCalculator&quot;</span>;

<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">class</span> ScientificCalculator extends BasicCalculator {
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">constructor</span>(value = 0) {
        <span class="hljs-keyword">super</span>(value);
    }

    <span class="hljs-keyword">public</span> square() {
        <span class="hljs-keyword">this</span>.value = <span class="hljs-keyword">this</span>.value ** <span class="hljs-number">2</span>;
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }

    <span class="hljs-keyword">public</span> sin() {
        <span class="hljs-keyword">this</span>.value = <span class="hljs-built_in">Math</span>.sin(<span class="hljs-keyword">this</span>.value);
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
    }
}
</code></pre>
<p>&#x56E0;&#x4E3A; <code>BasicCalculator</code> &#x7684;&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x4E86; <code>this</code>, TypeScript &#x8FC7;&#x53BB;&#x63A8;&#x65AD;&#x7684;&#x7C7B;&#x578B;&#x662F; <code>BasicCalculator</code>, &#x5982;&#x679C;&#x5728; <code>ScientificCalculator</code> &#x7684;&#x5B9E;&#x4F8B;&#x4E0A;&#x8C03;&#x7528;&#x5C5E;&#x4E8E; <code>BasicCalculator</code> &#x7684;&#x65B9;&#x6CD5;, &#x7C7B;&#x578B;&#x7CFB;&#x7EDF;&#x4E0D;&#x80FD;&#x5F88;&#x597D;&#x5730;&#x5904;&#x7406;.</p>
<p>&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">import</span> calc from <span class="hljs-string">&quot;./ScientificCalculator&quot;</span>;

<span class="hljs-keyword">let</span> v = <span class="hljs-keyword">new</span> calc(<span class="hljs-number">0.5</span>)
    .square()
    .divide(<span class="hljs-number">2</span>)
    .sin()    <span class="hljs-comment">// Error: &apos;BasicCalculator&apos; &#x6CA1;&#x6709; &apos;sin&apos; &#x65B9;&#x6CD5;.</span>
    .currentValue();
</code></pre>
<p>&#x8FD9;&#x5DF2;&#x7ECF;&#x4E0D;&#x518D;&#x662F;&#x95EE;&#x9898; - TypeScript &#x73B0;&#x5728;&#x5728;&#x7C7B;&#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;&#x4E2D;, &#x4F1A;&#x5C06; <code>this</code> &#x63A8;&#x65AD;&#x4E3A;&#x4E00;&#x4E2A;&#x7279;&#x6B8A;&#x7684;&#x53EB;&#x505A; <code>this</code> &#x7684;&#x7C7B;&#x578B;. <code>this</code> &#x7C7B;&#x578B;&#x4E5F;&#x5C31;&#x5199;&#x4F5C; <code>this</code>, &#x53EF;&#x4EE5;&#x5927;&#x81F4;&#x7406;&#x89E3;&#x4E3A; &quot;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x65F6;&#x70B9;&#x5DE6;&#x8FB9;&#x7684;&#x7C7B;&#x578B;&quot;.</p>
<p><code>this</code> &#x7C7B;&#x578B;&#x5728;&#x63CF;&#x8FF0;&#x4E00;&#x4E9B;&#x4F7F;&#x7528;&#x4E86; mixin &#x98CE;&#x683C;&#x7EE7;&#x627F;&#x7684;&#x5E93; (&#x6BD4;&#x5982; Ember.js) &#x7684;&#x4EA4;&#x53C9;&#x7C7B;&#x578B;:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">interface</span> MyType {
    extend&lt;T&gt;(other: T): <span class="hljs-keyword">this</span> &amp; T;
}
</code></pre>
<h2 id="es7-&#x5E42;&#x8FD0;&#x7B97;&#x7B26;">ES7 &#x5E42;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>TypeScript 1.7 &#x652F;&#x6301;&#x5C06;&#x5728; ES7/ES2016 &#x4E2D;&#x589E;&#x52A0;&#x7684;<a href="https://github.com/rwaldron/exponentiation-operator" target="_blank">&#x5E42;&#x8FD0;&#x7B97;&#x7B26;</a>: <code>**</code> &#x548C; <code>**=</code>. &#x8FD9;&#x4E9B;&#x8FD0;&#x7B97;&#x7B26;&#x4F1A;&#x88AB;&#x8F6C;&#x6362;&#x4E3A; ES3/ES5 &#x4E2D;&#x7684; <code>Math.pow</code>.</p>
<h3 id="&#x4E3E;&#x4F8B;">&#x4E3E;&#x4F8B;</h3>
<pre><code class="lang-ts"><span class="hljs-keyword">var</span> x = <span class="hljs-number">2</span> ** <span class="hljs-number">3</span>;
<span class="hljs-keyword">var</span> y = <span class="hljs-number">10</span>;
y **= <span class="hljs-number">2</span>;
<span class="hljs-keyword">var</span> z =  -(<span class="hljs-number">4</span> ** <span class="hljs-number">3</span>);
</code></pre>
<p>&#x4F1A;&#x751F;&#x6210;&#x4E0B;&#x9762;&#x7684; JavaScript:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">var</span> x = <span class="hljs-built_in">Math</span>.pow(<span class="hljs-number">2</span>, <span class="hljs-number">3</span>);
<span class="hljs-keyword">var</span> y = <span class="hljs-number">10</span>;
y = <span class="hljs-built_in">Math</span>.pow(y, <span class="hljs-number">2</span>);
<span class="hljs-keyword">var</span> z = -(<span class="hljs-built_in">Math</span>.pow(<span class="hljs-number">4</span>, <span class="hljs-number">3</span>));
</code></pre>
<h2 id="&#x6539;&#x8FDB;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x89E3;&#x6784;&#x7684;&#x68C0;&#x67E5;">&#x6539;&#x8FDB;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x89E3;&#x6784;&#x7684;&#x68C0;&#x67E5;</h2>
<p>TypeScript 1.7 &#x4F7F;&#x5BF9;&#x8C61;&#x548C;&#x6570;&#x7EC4;&#x5B57;&#x9762;&#x91CF;&#x89E3;&#x6784;&#x521D;&#x59CB;&#x503C;&#x7684;&#x68C0;&#x67E5;&#x66F4;&#x52A0;&#x76F4;&#x89C2;&#x548C;&#x81EA;&#x7136;.</p>
<p>&#x5F53;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x901A;&#x8FC7;&#x4E0E;&#x4E4B;&#x5BF9;&#x5E94;&#x7684;&#x5BF9;&#x8C61;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x63A8;&#x65AD;&#x7C7B;&#x578B;&#x65F6;:</p>
<ul>
<li>&#x5BF9;&#x8C61;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x4E2D;&#x6709;&#x9ED8;&#x8BA4;&#x503C;&#x7684;&#x5C5E;&#x6027;&#x5BF9;&#x4E8E;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x6765;&#x8BF4;&#x53EF;&#x9009;.</li>
<li>&#x5BF9;&#x8C61;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x4E2D;&#x7684;&#x5C5E;&#x6027;&#x5982;&#x679C;&#x5728;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x4E2D;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x7684;&#x503C;, &#x5219;&#x8BE5;&#x5C5E;&#x6027;&#x5FC5;&#x987B;&#x6709;&#x9ED8;&#x8BA4;&#x503C;, &#x5E76;&#x4E14;&#x4F1A;&#x88AB;&#x6DFB;&#x52A0;&#x5230;&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x7684;&#x7C7B;&#x578B;&#x4E2D;.</li>
<li>&#x5BF9;&#x8C61;&#x5B57;&#x9762;&#x91CF;&#x4E2D;&#x7684;&#x5C5E;&#x6027;&#x5FC5;&#x987B;&#x5728;&#x5BF9;&#x8C61;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x4E2D;&#x5B58;&#x5728;.</li>
</ul>
<p>&#x5F53;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x5B57;&#x9762;&#x91CF;&#x901A;&#x8FC7;&#x4E0E;&#x4E4B;&#x5BF9;&#x5E94;&#x7684;&#x6570;&#x7EC4;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x63A8;&#x65AD;&#x7C7B;&#x578B;&#x65F6;:</p>
<ul>
<li>&#x6570;&#x7EC4;&#x89E3;&#x6784;&#x7ED1;&#x5B9A;&#x4E2D;&#x7684;&#x5143;&#x7D20;&#x5982;&#x679C;&#x5728;&#x6570;&#x7EC4;&#x5B57;&#x9762;&#x91CF;&#x4E2D;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x7684;&#x503C;, &#x5219;&#x8BE5;&#x5143;&#x7D20;&#x5FC5;&#x987B;&#x6709;&#x9ED8;&#x8BA4;&#x503C;, &#x5E76;&#x4E14;&#x4F1A;&#x88AB;&#x6DFB;&#x52A0;&#x5230;&#x6570;&#x7EC4;&#x5B57;&#x9762;&#x91CF;&#x7684;&#x7C7B;&#x578B;&#x4E2D;.</li>
</ul>
<h3 id="&#x4E3E;&#x4F8B;">&#x4E3E;&#x4F8B;</h3>
<pre><code class="lang-ts"><span class="hljs-comment">// f1 &#x7684;&#x7C7B;&#x578B;&#x4E3A; (arg?: { x?: number, y?: number }) =&gt; void</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f1</span>(<span class="hljs-params">{ x = 0, y = 0 } = {}</span>) </span>{ }

<span class="hljs-comment">// And can be called as:</span>
f1();
f1({});
f1({ x: <span class="hljs-number">1</span> });
f1({ y: <span class="hljs-number">1</span> });
f1({ x: <span class="hljs-number">1</span>, y: <span class="hljs-number">1</span> });

<span class="hljs-comment">// f2 &#x7684;&#x7C7B;&#x578B;&#x4E3A; (arg?: (x: number, y?: number) =&gt; void</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f2</span>(<span class="hljs-params">{ x, y = 0 } = { x: 0 }</span>) </span>{ }

f2();
f2({});        <span class="hljs-comment">// &#x9519;&#x8BEF;, x &#x975E;&#x53EF;&#x9009;</span>
f2({ x: <span class="hljs-number">1</span> });
f2({ y: <span class="hljs-number">1</span> });  <span class="hljs-comment">// &#x9519;&#x8BEF;, x &#x975E;&#x53EF;&#x9009;</span>
f2({ x: <span class="hljs-number">1</span>, y: <span class="hljs-number">1</span> });
</code></pre>
<h2 id="&#x88C5;&#x9970;&#x5668;-decorators-&#x652F;&#x6301;&#x7684;&#x7F16;&#x8BD1;&#x76EE;&#x6807;&#x7248;&#x672C;&#x589E;&#x52A0;-es3">&#x88C5;&#x9970;&#x5668; (decorators) &#x652F;&#x6301;&#x7684;&#x7F16;&#x8BD1;&#x76EE;&#x6807;&#x7248;&#x672C;&#x589E;&#x52A0; ES3</h2>
<p>&#x88C5;&#x9970;&#x5668;&#x73B0;&#x5728;&#x53EF;&#x4EE5;&#x7F16;&#x8BD1;&#x5230; ES3. TypeScript 1.7 &#x5728; <code>__decorate</code> &#x51FD;&#x6570;&#x4E2D;&#x79FB;&#x9664;&#x4E86; ES5 &#x4E2D;&#x589E;&#x52A0;&#x7684; <code>reduceRight</code>. &#x76F8;&#x5173;&#x6539;&#x52A8;&#x4E5F;&#x5185;&#x8054;&#x4E86;&#x5BF9; <code>Object.getOwnPropertyDescriptor</code> &#x548C; <code>Object.defineProperty</code> &#x7684;&#x8C03;&#x7528;, &#x5E76;&#x5411;&#x540E;&#x517C;&#x5BB9;, &#x4F7F; ES5 &#x7684;&#x8F93;&#x51FA;&#x53EF;&#x4EE5;&#x6D88;&#x9664;&#x524D;&#x9762;&#x63D0;&#x5230;&#x7684; <code>Object</code> &#x65B9;&#x6CD5;&#x7684;&#x91CD;&#x590D;<sup>[1]</sup>.</p>

                                
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